Means for cooling piston-rods and pistons.



i. MCKECHNIE. i MEANS FORv COOLING PISTON RODS AND PISTONSK APPLmAToN m59 iuNE 29, sans.

Pamnd Nov. 28, 19m.

f BESTAVAILABLE corrl JAIMES IMIGKEGHNIE.,4 BARROW-NFURNESS, V.TEJAl'G-IV.|A.`l\l]), ASSIGNUR 'IO VICKEBS LIMETEZD, DF LONDN, ENG-LAND.

nnnus'ron comme risticii-nous Ann Pisroivs. d

Specification of Letters Patent.

resented. Nov.' es, i916.

originel application led February 12, 1916, Serial No. 77,937. Divided andthis application filed June 29,

, 1916. Serial No. 106,634.

To all whom it may concern Be it known that I, JAMES MoKnoHNLu,

u, subject of. the King of Great Britain, re'- sidin'g at Novel Construction Works, Ben,

row-in-Furness, in the county of Lancaster, England, have invented certain new and useful improvements in Means for Cooling Pistondods and Pistonsg'of which the following is e. Speciozition.

Thls lnventicn relates to ineens for water cooling the piston rods and pistons of in- I teruel combustion .engines of large size and more especially to the cooling` of the' large central piston rand rod of e three piston engine' of balanced-type, in which ,the central end outer pistonsv travel in opposite direc tions.

According; to this invention lxed concentric ,water tubes puse through the endfof' the cylinder end extend into the piston rod, the central fixed tube passing through the upper part ofthe hollow piston rod which isulso provided with e Central tubemaking e sliding Contact with the lined tube und forming en annular water channel 'through out the length of 'the rod, AThe piston is lhollow and communicates with the annuler water channel surrounding the fixed central tube, the water passing through'the central tubes in one direction and through the surrounding unnuler channel inthe other, flowing 'through the hollow piston in its course.

' In order that the seid invention muy be clearly understood and readily carried into eect, the same will now be described more fully with reference to .the accompanying drawing, which showsfin vertical. section part of e balanced three piston engine hav ing' the improved cooling Ineens for its centrol )pistfni rod. end piston,

A is the engine casing.: B is the control cjvllnder end C, Cerethe outer cylindersI D is 'the large central piston 'with heevy tubular piston rod Z und E, E are the smaller side pistons working in the opposite direction to the pieton D and with e combined cross sectional urea ,equal to that oi the central piston. The piston rod d is provided with the short thick connecting rod al lending to the corresponding' cra-11k of the crunk shaft. Connecting rods e are pro vided for the side trunk pistons E.

two fixed tubes G und G.,

the side cylinders C,fthe lowenpart of thel jacket alsosurroundng the central part a of. the casing, through which the tubular piston rodd posses, so that the water jacket assists in cooling' this rod.

lVeter'is introduced by the inlet gtln'oueth the fixed tube G that leeds through the eenter of the cylinder or pump cover o und posses in to the end of the piston rod tube y', which slides upon the tube G as thefpston reciprocutes. The outer fixed tube G havi ingV an outlet g2 et its upper end surrounds the central inlet tube G, leaving; en annular i channel for the outward flow ofthe water, this outer tube passing through a standing);V box d2 1n the upper end of the piston rod d which extends through the piston. The stuiing box therefore slides upon the tube' G as the pistou reciprocutes, maintaining u weterA tight joint.

The tube g extends from` the tube extenl, sion lg et the outer end of the rod d to just within the piston D, which is hollow.v A. smell coller et geloses the annular passage et the top of the ytube g immediately above openings gf formed in the piston rod end piston und lending to the interior, of the letter, return openings g5 passing beek from the upper part of the piston chamber to the water channel in the rod d. The central tube extension gx' lis perforated at y to allow ofA communication with, the annular return channel 4formed between the ,tube

end. the inner well of the tubular piston rod.

sidev the piston rod und thence to the outlet g2 through'the annuler passage between the An `efficient circulation through all parts of thepiston and piston rod exposed to high temperature 1s thus obtained, and the circulation is asslsted The coolingr water flows downwardly* BEST AVAILABLE con by the reeiprocation of the piston and piston rod upon, the fixed water tubes and Cr.

LWhat l'. claim und desire to secure by Letters Patent of the United States is l. in :in internal combustion engine a cylinder, :i piston, a tubular piston rod, fixed water inlet and-outlet tubes arranged one within the other and passing through the end of the cylinder und a central Water tube in the said piston rod1naking sliding Contact with the cent1-al fixed tube, the said water tubes being adapted to provide a longitudinal flow of cooling water in the piston rod through the central tubes and surrounding annular hannel.

2. In an internal combustion engine a cylinder, a hollow piston, a tubular piston G to the upper my signature.

JAMES MOKVECHNIE.

rod, passages tubes being arranged. to provide f 

